Charles a



(No Model.)

0. A. PFLUGER. ELECTRIC ARC LAMP.

No. 541,179. Patented June 18, 1895.

ATTORNEY QITNEDDEU UNITED STATES PATENT OFFICE.

CHARLES A. PFLUGER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE STANDARD ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 541,179, dated June 18, 1895.

' Application filed July 2, 1894- Serial No.5l6,326. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES A. PFLUGER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Are Lamps, of which the following is a specification.

My invention relates to are lamps and has for its object to produce an improved, cheap and simple lamp, of which the following is a description, reference being had to the accompanying drawing which is a diagrammatic view of the lamp.

A and B are the two carbons and are contained in the tubes A B. The carbons are provided at their upper end; with the caps A B to which are attached the flexible wires A I3 The carbon tubes A B are provided with slots A B for the passage of the wires A B At the lower ends of the carbon tubes are the lugs A B to which are pivoted the arms A B carrying the pins or points A B which limit the downward motion of the carbons. The other ends of said arms are provided with the set screws A B by which the arms A B are moved so as to move the points A 13 out of the way when new carbons are inserted. Said arms A B areinsulated from the tubes A B.

0 C C are pieces rigidly attached to the carbon rods, and are free to move about the pivot 0 These pieces are insulated from each other by the insulation C The pivot C also passes through the frame C which carries 5 the solenoid The core C of said solenoid is attached to the strips C C by pivot C which also connects the ends of said strips together. Said strips are pivotally connected to the carbon tubes A 13 and are insulated 4o therefrom. The carbons are kept together by the weight of the core C. WVhen the lamp is not burning the weight of said core also acts against the solenoid C in the operation of the lamp. I may also use a spring or the like to oppose the action of the solenoid when desirable.

As shown in the drawing the solenoid C is a series and shunt wound, or differential solenoid.

The binding post D is connected by wire A with carbon A. Binding postD is connected by wire D to the series coil of solenoid C which is connected by wire B to carbon B. The wires D D connect the shunt coil with the binding posts D D. I may use separate soleuoidsinstead ofcombiningthem, as shown in the drawing. If desired I may use a single series magnet, or may feed the carbons by a positive feed. The carbons are connected directly to the circuit and hence a sliding con- 6:: tact avoided.

It is evident that these several parts may be varied in form, construction and arrangement without departing from the spirit of my invention, and I therefore do not wish to be limited to the exact construction shown.

The use and operation of myinvention are as follows: \Vhen it is desired to supply the lamp with carbons the caps A B may be pulled out at the top of the tubes A B and 0 the carbons inserted, or the carbons may be replaced by screwing up the set screws A B until the points A B are out of the way, and then inserting the carbons in the lower end. Said points are readjusted when the carbons 7 are in place. By the latter method the danger of injuring the points A b is obviated. WVhen no current is passing through the lamp the weight of the core C keeps the carbons together. If now the current is turned on the solenoid C attracts its core C which, being pivoted to the strips C moves their connected ends upwardly. This movement shortens the distance between the upper ends of the carbon tubes A B and rocks said tubes about the pivot C thus separating the carbons A B and striking the arc. After the arc is struck the carbons are fed by their own weight. Additional weights or springs may be used to aid the feed if desired. If the current is cut off, the downward pull of the core C brings the carbons together. If while thelamp is working the current varries, as by the carbons getting too close together or too far apart on account of the obstruction of the feed or 5 the like, the solenoid G acts to bring them into the proper relations.

It will be seen that .I have here a simple, short lamp, with very little mechanism to get out of order and injuriously affect the workno ing of the lamp.

I claim-- 1. The combination in an arc lamp of two carbons at an angle'with each other, tubes containing said carbons, a solenoid connected to said tubes so as to be supported thereby, and a pivotal connection between the core of said solenoid and each of said tubes, whereby said tubes are moved by the movement of the core.

2. The combination in an arc lamp of two carbons at an acute angle with each other, tubes containing said carbons pivoted together at some point between their ends, a solenoid on a frame supported at said pivotal point andhaving its core pivotally'connected to both carbon holders, whereby the distance CHARLES A. PFLUGER.

Witnesses:

DONALD 1VLOARTER, WALTER J. GUNTHORP. 

